Composite insulating material



March 17, 1931. c UPSON ET AL 1,796,675

COMPOSITE IIiSULATING' MATERIAL Filed Aug. 14, 1928 I fnueniors CZQKZGS 11 @5020 g m 5 '67'LC67' flair ATTORNEYS Patented Mar. 17, 1931 UNITED STATES PATENT OFFICE CHARLES A. UPSON AND HUGH I. SPENCER, OF LOCKPOBT, NEW YORK, ASSIGNORS TO THE UPSON COMPANY, OF LOCKPORT, NEW YORK A (3OItPOIRA'ZISION OF NEW YORK OOMPClSITE INSULATING MATERIAL Application. filed August 14, 1928. Serial No. 289,581.

Our present invention relates to the manuand has for its object to provide an improvedv article of this character. The improvements are directed in part toward furnishing a light and flexible but strong sheet of'mateqrial' having a fibre center and one or more lining sheets attached thereto in such a manner as to hold the heterogeneously\ formed mass firmly in place in the structure. The

improvements are also directed toward providing a composite. felted bat or center in which a cheap, weak and poorly felted material may be used in combination with a means for strengthening it and binding the contact and adhesion between the center and facing or liners that are applied to the 0pposite faces thereof.

To these and other ends the invention resides in certain improvements and combinations of parts, all as will be hereinafter more.

fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a-perspective view of a fragment of insulating material constructed in accordance with and illustrating one embodiment of my invention, portions of the liner sheets being cut away to reveal interior ele-- ments;

Figure 2 is a longitudinalsection therethrough, and

Figure-3 is a transverse section on the line 33 of Figure 2.

Similar reference numerals throughout the several views indicate the same parts.

This invention is an improvement upon that disclosed in the prior application, Serial No. 256,249, filed February 23, 1928, in which is described the general structure of the preferred form of my insulating bat. Referring briefly to this general structure, the central body of felted fibrous material is indicated generally at 1, and the larger proportion thereof may consist of a flocculent mass constituted as hereinafter described and v felted down to a soft spongy condition that is porous and resilient. There is applied to one or both surfaces thereof a plurality of narrow thin flexible strips 2 and 3that are laid in parallelism longitudinally of the bat strip, and spaced laterally from each other as shown in Fig. 1. Ordinarily we use paper for this purpose. and where the strips are applied to both sides of the bat the units on one side are respectively placed opposite corresponding units on the other side. We then sew the bat and strips together with longitudinal rows of stitching 4. In some cases we use double rows of stitching on some of the interior strips as shown. Finally there is applied to one or both sides of the resulting-structure a flexible liner sheet 5 of paper or other material, previously coating the under side of the liner with an adhesive body 6, such as a solution of silicate of soda, as-

phaltum. glue or other appropriate substances known in the paper making art. This adhesive may be applied to the entire face of the liner, so that it adheres directly to the bat 1, or it may be applied along lines corresponding to the strips 2 and 3, or it'may be applied to the strips instead of to the liner. In any event, its. function is to firmly attach the liner to the sewn strips, as shown in section in Figs. 1 and 2, and not only this but to cement and lock the exposed ends of the stitches 4 in place, they being imbedded in the adhesive body. so that they do not give and enlarge the holes in the strips through which they pass.

Asphaltum is preferably used as the adhesive element where waterproofing of the outer paper liners is desired, or other adhesives of a waterproofing character can be used or waterproofing may be effected by a treatment additional tothe application of the adhesive.

In the practice of my present invention, in the composition of the central body 1, we find it both convenient and economical to use a low grade of cotton,such as damaged or waste cotton, as the principal constituent. The fibres thereof'being short and weak they felt poorly, and as most of them are not long enough to reach from one adhesive liner 5 to the other there is nothing to prevent the bat from s litting and tearing under severe treatment.

fibres of which are indicated at 7 in the draw- 7 ings The proportion thereof is referably from ten to thirty per cent accor to its own quality and the quality of the cotton or weak material.

It is to be understood that we do not limit ourselves to the combination of materials specifically referred to, as the principal idea is to use a weak material that is cheap and incapa- Me of binding in combination with an interspersed stronger and longer material which has this capability.

We claim asour invention:

1. As an article of manufacture, a; composite insulating material embbdying in com.-

bination a felted bat of loosely associated heterogeneous fibresof one nature and mate-- rial, the same being inters ersed with stronger and longer fibres of a d1fl1'erent pa ture and material, stitching distributed therethrouih and adapted to extend from one side of t e material to the other and thin liners secured -to opposite sides of the bat, by means of ada hes'ive material, said liners adapted to support the stitching in sustained reenforcing position. 1

2. As an article of manufacture, a composite insulating material embodying in comin'ation "a felted bat of loosely associated heterogeneous fibres of one nature, and material, the same being interpsersed with stronger. fibres of a diiferent nature and material,

strips disposed on either side of the bat, stitching supported over said strips and extending through the bat for the'purpose of reenforcing the same, liners secured to opposite sides of the bat by means of adhesivematerial and adapted to secure the stitching in position. e CHARLESA. HUGH M. SPENCER." 

